/*
 * The contents of this web application are subject to the Mozilla Public License Version 
 * 1.1 (the "License"); you may not use this web application except in compliance with 
 * the License. You may obtain a copy of the License at http://www.mozilla.org/MPL/.
 * 
 * Software distributed under the License is distributed on an "AS IS" basis, 
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License 
 * for the specific language governing rights and limitations under the License.
 * 
 * The Original Code is owned by and the Initial Developer of the Original Code is 
 * Composite A/S (Danish business reg.no. 21744409). All Rights Reserved
 * 
 * Section 11 of the License is EXPRESSLY amended to include a provision stating 
 * that any dispute, including but not limited to disputes related to the enforcement 
 * of the License, to which Composite A/S as owner of the Original Code, as Initial 
 * Developer or in any other role, becomes a part to shall be governed by Danish law 
 * and be initiated before the Copenhagen City Court ("K�benhavns Byret")            
 */

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Reflection;
using System.Xml.Linq;
using System.IO;

namespace Composite.Tools.PackageCreator
{
    public class ReferencedAssemblies
    {
        public static object _lock = new object();

        private static Dictionary<string, HashSet<string>> _referenced;
        private static Dictionary<string, HashSet<string>> Referenced
        {
            get
            {
                lock (_lock)
                {
                    if (_referenced == null)
                    {
                        _referenced = new Dictionary<string, HashSet<string>>();
                        foreach (var assembly in AppDomain.CurrentDomain.GetAssemblies())
                        {
                            if (assembly.IsBinFolder())
                            {
                                var name = assembly.ManifestModule.Name;

                                foreach (var raName in assembly.GetReferencedAssemblies())
                                {
                                    try
                                    {
                                        var ra = Assembly.Load(raName);
                                        if (ra != null && ra.IsBinFolder())
                                        {
                                            _referenced.Add(name, ra.ManifestModule.Name);
                                        }
                                    }
                                    catch { }
                                }
                            }
                        }
                    }
                    return _referenced;
                }
            }
        }

        public static int AssemblyPosition(XElement element)
        {

            var targetFilename = element.AttributeValue("targetFilename");
            if (targetFilename != null)
                return AssemblyPosition(Path.GetFileName(targetFilename));

            var path = element.AttributeValue("path");
            if (path != null)
                return AssemblyPosition(Path.GetFileName(path));

            return 0;
        }

        public static int AssemblyPosition(string name, string[] chain = null)
        {
            if (name.Equals("Composite.Generated.dll", StringComparison.CurrentCultureIgnoreCase))
                return 0;

            if (chain != null && chain.Contains(name))
                return int.MaxValue / 2;

            if (Referenced.ContainsKey(name))
            {
                var newchain = (chain ?? new string[] { }).Concat(new[] { name }).ToArray();
                return Referenced[name].Select(d => AssemblyPosition(d, newchain)).Max() + 1;
            }
            return 0;
        }
    }
}
